Skyrmions in a Doped Antiferromagnet
arXiv:1006.1891 · doi:10.1103/PhysRevLett.106.227206
Abstract
Magnetization and magnetoresistance have been measured in insulating antiferromagnetic La_{2}Cu_{0.97}Li_{0.03}O_{4} over a wide range of temperatures, magnetic fields, and field orientations. The magnetoresistance step associated with a weak ferromagnetic transition exhibits a striking nonmonotonic temperature dependence, consistent with the presence of skyrmions.
4+ pages, 3 figures (some low resolution), supplementary material (3 pages); discussion expanded, references added; as published